SELENOM Knockout Induces Synaptic Deficits and Cognitive Dysfunction by Influencing Brain Glucose Metabolism

Area of Science:

• Neuroscience
• Metabolic Research
• Molecular Biology

Background:

• Selenium is a trace element vital for selenoprotein function, impacting memory and glucose metabolism.
• SELENOM, an endoplasmic reticulum lumen selenoprotein, has an uncharacterized role in brain function.
• Dysregulation of glucose metabolism and insulin signaling are implicated in cognitive decline.

Purpose of the Study:

• To investigate the role of SELENOM in synaptic plasticity and cognitive function in mice.
• To explore the impact of SELENOM deficiency on brain glucose metabolism and insulin signaling.
• To determine the effect of a high-fat diet on cognitive function in SELENOM knockout mice.

Main Methods:

• Generation and analysis of SELENOM knockout mice.
• Assessment of synaptic plasticity and memory performance.
• Measurement of glucose metabolism and brain insulin signaling pathway activity (PI3K/AKT/mTOR/p70 S6 kinase).
• Evaluation of cognitive function under high-fat diet conditions.

Main Results:

• SELENOM knockout mice exhibited decreased synaptic plasticity and memory impairment.
• SELENOM deficiency led to hyperglycemia and disrupted glucose metabolism.
• Knockout of SELENOM inhibited the brain insulin signaling pathway.
• High-fat diet exacerbated cognitive deficits in SELENOM knockout mice at an earlier age.

Conclusions:

• SELENOM knockout induces synaptic deficits and cognitive dysfunction through the inhibition of the brain insulin signaling pathway.
• SELENOM plays a critical role in regulating brain glucose metabolism and maintaining synaptic plasticity.
• These findings underscore the importance of SELENOM in neurological health and metabolic regulation.